Patents Assigned to Zeni Lite Buoy Co., Limited
  • Cylindrical lens and a manufacturing method for the same
    Patent number: 5235467
    Abstract: A lens in a shape of cylinder or head-cut-off cone made of transparent thin film materials with a fine prism-shaped fresnel lens surface formed thereon. The cylindrical lens is manufactured by forming a fine prism-shaped linear fresnel lens surface on a thin transparent film, shaping the film into a cylinder or a frustum of a cone, and connecting both ends of the film so that the fresnel center line forms a horizontal ring.
    Type: Grant
    Filed: November 4, 1991
    Date of Patent: August 10, 1993
    Assignee: Zeni Lite Buoy Co., Limited
    Inventor: Koichi Nagamachi
  • Spar-buoy boring derrick and mooring facility
    Patent number: 5044450
    Abstract: A spar-buoy type boring device including a main pipe and a central pipe installed in the main pipe. The main pipe, which has a service deck at the top and a float near the top so that the float stays underneath the water, is anchored at the bottom to a sinker which is placed on the seabed, and the central pipe with the bottom end opening in the sea is used for guiding boring equipments to the seabed and collecting samples from the seabed.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: September 3, 1991
    Assignee: Zeni Lite Buoy Co., Limited
    Inventors: Hiroshi Aso, Jyunichi Harada